| A KIVA-3V based numerical simulation has been performed to study the in-cylinder flow field and fuel mixture formation process in a 5.4L V8 3-valve low pressure direct injection gasoline engine. GRIDGEN, which is a commercial grid generator software program, was used to build a fine mesh for the single cylinder with over a half million computational cells configured in 50 blocks. To resolve the problems of fine moving mesh in KIVA-3V, a new rezoner methodology was implemented. Simulation results show that the effect of injector spray pattern, enabled by the use of multi-hole fuel injectors to achieve spray tailoring flexibility, is a key factor to improve the fuel charge homogeneity in the cylinder. |
